自己寫一個(gè)工具類

public?class?Data?{
????private?static?JSONArray?pieData;

????public?static?String?getPieData()?throws?JSONException?{
????????if?(pieData?==?null)?{
????????????synchronized?(Data.class)?{
????????????????if?(pieData?==?null)?{
????????????????????pieData?=?new?JSONArray();
????????????????????HashMap<String,?Integer>?map1?=?new?HashMap<>();
????????????????????map1.put("外賣",?34);
????????????????????map1.put("娛樂",?21);
????????????????????map1.put("其他",?45);
????????????????????pieData.put(getItem("2018年1月",?map1));

????????????????????HashMap<String,?Integer>?map2?=?new?HashMap<>();
????????????????????map2.put("外賣",?42);
????????????????????map2.put("娛樂",?65);
????????????????????map2.put("其他",?12);
????????????????????pieData.put(getItem("2018年2月",?map2));

????????????????????HashMap<String,?Integer>?map3?=?new?HashMap<>();
????????????????????map3.put("外賣",?34);
????????????????????map3.put("娛樂",?123);
????????????????????map3.put("其他",?24);
????????????????????pieData.put(getItem("2018年3月",?map3));

????????????????????HashMap<String,?Integer>?map4?=?new?HashMap<>();
????????????????????map4.put("外賣",?56);
????????????????????map4.put("娛樂",?45);
????????????????????map4.put("其他",?90);
????????????????????pieData.put(getItem("2018年4月",?map4));
????????????????}
????????????}
????????}

????????return?pieData.toString();
????}


????@SuppressLint("NewApi")
????private?static?JSONObject?getItem(String?date,?HashMap<String,?Integer>?map)?throws?JSONException?{
????????JSONObject?obj?=?new?JSONObject();
????????JSONArray?arr?=?new?JSONArray();

????????Set<String>?set?=?map.keySet();
????????String[]?keys?=?new?String[set.size()];
????????set.toArray(keys);
????????for?(int?i?=?0;?i?<?keys.length;?i++)?{
????????????JSONObject?object?=?new?JSONObject();
????????????object.put("title",?keys[i]);
????????????object.put("value",?map.get(keys[i]));
????????????arr.put(object);
????????}
????????obj.put("date",?date);
????????obj.put("obj",?arr);
????????return?obj;
????}


}